“AMERICAN 
SOURNAL ‘OF SCIENCE AND ARTS. 
* 
: * 4 
[SECOND SERIES.} 
Arr. xxv me Remarks in regard to the Period of Elevation 
4G those aa mn the Rocky nes gpa near the sources of the 
issoure | River-and its Tributaries ; by Dr. F. V. HayDEN.* 
Tenet from Capt. Wa. F. Rarvown’s forthcoming el aad and perme by 
“permission of the War Department. ] 
nae ot of the aan article, is to show, as nearly 
own geological data, the period of ae elevation 
_ 
\ 2 i? te the whole Rocky Mountain district. It will be im- 
ible, at this time, to mention in detail all the facts in support. 
our giey and therefore ay shall assume that the ee 
articles 8 for this Baral which will have a more or less ¢ 
eearing on the — geography of of this cies and the ine 
) of our coun ? s 
Soin desk ehaencker of those subterranean forces which 
portant results in the West ar e fully discussed in those 
Vou. XXXII, No. 99.—May, 1862. 
